DTC 22: Driver's Air Bag Module (Squib) System Fault 2 (Open in the Squib Circuit): Diagnosis

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools:

MB991502: Scan Tool (MUT-II)
MB991613: SRS Check Harness
MB991865: Dummy Resistor
MB991866: Resistor Harness
MB991223 (MB991222): Harness Set (Probe)

STEP 1. Check the SRS-ECU to clock spring line.
1. Disconnect the negative battery terminal.
2. Disconnect the clock spring connector C-204 (4-pin).
  
  Fig 1: Identifying Clock Spring Connector C-204 (4-Pin)
  Courtesy of DAIMLERCHRYSLER CORPORATION
3. Connect special tool MB991865 to special tool MB991866.
  CAUTION: Do not insert a test probe into the terminal from its front side directly as the connector contact pressure may be weakened.
4. Insert special tool MB991866 into the clock spring harness side connector C-204 (terminal No.3 and 4) by backprobing.
5. Connect the negative battery terminal.
6. Erase the DTC memory, and then recheck the DTC.
Q: Is DTC 22 set?

YES : Go to Step 3.

NO: Go to Step 2.

Fig 2: Identifying Special Tools
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 2. Check the clock spring and the driver's air bag module.
1. Disconnect the negative battery terminal.
2. Connect connector (4) of special tool MB991613 to clock spring connector C-208.
3. Connect connector (1) of special tool MB991613 to connector (2).
4. Connect terminals 22 to 24, and terminals 23 to 25 of special tool MB991613 to connector (5).
5. Connect the clock spring to the instrument panel wiring harness.
6. Connect the negative battery terminal.
7. Erase the DTC memory, and then recheck the DTC.
Q: Is DTC 22 set?

YES : Replace the clock spring (Refer to AIR BAG MODULES AND CLOCK SPRING ). Then go to Step 4.

NO: Replace the driver's air bag module (Refer to AIR BAG MODULES AND CLOCK SPRING ). Then go to Step 4.

Fig 3: Connecting Clock Spring To Instrument Panel Wiring Harness
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 3. Check the harness between the SRS-ECU connector C-137 (terminal No.7 and 8) and the clock spring connector C-204 (terminal No.3 and 4) for open circuit.
1. Disconnect the SRS-ECU connector C-137 and the clock spring connector C-204.
  
  Fig 4: Identifying SRS-ECU Connector C-137
  Courtesy of DAIMLERCHRYSLER CORPORATION
  
  Fig 5: Identifying Clock Spring Connector C-204
  Courtesy of DAIMLERCHRYSLER CORPORATION
  
  CAUTION: Do not insert a test probe into the terminal from its front side directly as the connector contact pressure may be weakened.
2. Check for continuity between the following terminals.
  C-137 connector C-204 connector
  
  7 - 3
  
  8 - 4
  
  It should be less than 2 ohms.
Q: Does continuity exist?

YES : Erase the DTC memory, and recheck if any DTC sets. If DTC 22 sets, replace the SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU) ). Then go to Step 4.

NO: Repair the harness wires between the SRS-ECU connector C-137 and the clock spring connector C-204. Then go to Step 4.

Fig 6: Checking Continuity Between C-204 Connector Terminals
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 4. Check the DTC.
Q: Is DTC 22 set?

YES : Return to Step 1.

NO: The procedure is complete (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to TO COPE WITH INTERMITTENT MALFUNCTION ).